Calculating-machine.



No. 879,449. PATENTED FEB. 18, 1908. E. s. ENSIGN.

APPLIUATION FILED MAY 3, 1906- 12 SHEETS-SHEET 1.

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' Emu S. Ensign. $5; 5M aflZf iQM Attorney No. 879,449. PATENTED FEB.18, 1908.

E. s. ENSIGN.

CALCULATING MACHINE.

APPLICATION FILED MAY 3. 1906.

12 SHEETS-SHEET '3.

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No. 879,449. PATENTED FEB. 18, 1908. E. S. ENSIGN.

CALCULATING MACHINE.

APPLICATION FILED MAY s. 1906.

12 SHEETS-SHEET 4.

Witnesses. nv nt r. W V Emory SEnsigm 0 5M MaWM Attorney.

N0. 879 449. P TE TED B. 18 1 I E. s. ENSIGN. A N E 908 CALCULATING MACHINE.

APPLIOATION FILED MAY 3 1906.

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PATENTED FEB. 18, 1908. E. s. ENSIGN1 CALCULATING MACHINE.

APPLICATION FILED MAY 3, 1906.

12 SHEETSSHEET 6.

J04 m not. 2 5 11510] 11 Ill n I II 116. wM J E/M ATZDY 'No. 879,449. PATENTED FEB. 18, 1908. E. S. ENSIGN.

CALCULATING MACHINE.

APPLICATION FILED HAYS, 1906.

7 l2 SHEETS-SHEET 7.

| In IIIIII "Illll lun- Im-nm will ATTY I N0. 8'79,4fl9. PATENTED FEB. 18, 1908.

E. S. ENSIGN.

CALCULATING MACHINE.

APPLICATION FILED MAY 3. 1906.

12 SHEETS-SHEET 8.

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No. 879,449. PATENTED FEB. 18, 1908. E. S. ENSIGN.

CALCULATING MACHINE.

l V/T/VESSES' ATTY No. 879,449. PATENTED FEB. 18, 1908. E. S. ENSIGN. CALCULATING MACHINE.

APPLICATION FILED MAY 3, 1906.

12 SHEETS-SHEET 10.

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m C m .L C 7 t No. 879,449. PATENTED FEB. 18, 1908. E. S. ENSIGN. CALCULATING MACHINE.

APPLICATION FILED MAY 3. 1906.

12 SHEETS-SHEET 12.

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January 2n UNITED STATES PATENT onnros.

EMORY S. ENSIGN, OF NEWTONVILLE, MASSACHUSETTS, ASSIGNOR TO ENSIGN MANU- FACTURING COMPANY, OF CHUSETTS.

BOSTON, MASSACHUSETTS,

Specification of Letters Patent. Application filed May 3. 1906. Serial No. 315,021.

A CORPORATION OF MASSA- CALCULATING-MACHINE.

Patented Feb. 18, 19 08.

To all whom it'may concern:

Be it known that I, EMORY S..ENs1eN, a citizen of the United States, residing at Newi I I i tonville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Calculating- Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

y invention relates to certain improvements in calculating-machines, particularly of that type shown in my United States Letters Patents numbered 773,632 dated November 1st, 1904, and 809,047 dated 1906, adapted to the erformance of multiplication and other arit metical processes and has for its main object the obtaining upon a meter the product in multiplication in a more certain and perfect manner and with greater rapidity than has heretofore been done.

One object of the invention is to provide an improved multiplication machine, of comparab y few operating parts, which will be simplicity itself in operation so that its operation may be quickly acquired.

represented by eac 1 of the primary" To this end my invention consists, first, in

novel means for transmitting the movement of the primary or adding keys to the indicating mechanism, whereby all the keys may receive precisely the same degree of downward movement without regard to the values which they represent, while the effective movement transmitted to the indicating mechanism will be giro ortioned to the value means for allowing of the instant returning or adding keys to their normal positions by a single operating-lever after the indicating devices have been moved to the desired positions in any of the various arithmetical problems third, in novel means for automatically returning the primary or adding keys to-their normal positions in problems of addition as soon as the meter asbeen operated by the depressed keys;

fourth, in novel means for holding each of the depressed toothed segments, displaced out of normal position by the pressure down upon its respective primary or fingerkey, in driving contact to be met by the meter, when it is revolved with the driving-shaft, and operated by the teeth of the depressed segments fifth, in novel means for transmitting ey; second, in novel I the depressed have been had the meter not meter-whee the movement of the secondary or multiplying keys to the'indicating mechanism, whereby all of these keys may receive precisely the same degree of downward movement without regard to the values which they represent wliilethe multiplicand represented by the depressed primary or adding keys may be quickly and accurately multiplied by any one of the depressed secondary or multiplying keys and the product shown on the meter; sixth, in novel means for automatically returning eachof secondary or nrultiplying keys to their normal position as the meter is operated by contact with the toothed segments; seventh, in-novel means for automatically shifting the meter, in problems of multiplication and division immediately after the meter has been operated according to the depressed primary keys and the depressed secondary key, one position to the right so that the next operation of depressing a secondary key will cause a than it would been shifted; eighth, in novel means for automatically shifting the meter to the right, without revolving it or its driving-shaft, when one or more naughts appear in the multiplier; ninth, in novel means for resetting the meter backward from right to left to its normal position; tenth, in novel means for showing upon an indicator (or secondary meter) the number of revolutions the meter has been caused to make by its driving-shaft,

ten times greater in each case the turning of and in multiplication showing the multivmultiplication to be made which would be pher, z. e., the depressed secondary keys and the position of the meter when each of the keys was depressed; eleventh, in novel means for simultaneously operating all of the wheels of the meter to be operated by the depressed toothed segments upon eachrevolution of the driving-shaft; twelfth, in novel means forreventing over-rotation of the s when they are operated by contact with the toothed segments; thirteenth, in novel carry-u mechanism; fourteenth, in novel means or preventing overrotation when the carry-up mechanism is operated; fifteenth in novel means for instantly and simultaneously resetting the meter and indicator to their. normal or zero position; siXteenth,-in novel means for revolving the meter independently of the secondary or multiplying keys, for use in problems of addition and subtraction.

It consists further,.in the legitimate combinations of the features referred to with each other and with other featuresnot yet alluded to, and in numerous'other subordimate but important combinations, and also in certain specific features of construction, all

of which will be fully described hereinafter.

of Fig. 1. line 4-4 of Fig. l in the direction of the ar- In the accompanying drawings, Figure 1 is a plan view of a calculating-machine constructed in accordance with my invention, with thecasing removed; the multiplying mechanism being taken on the line 1-1 of Fig. 2, and the remainder of the machine on the line 2-2 of Fig. 3; Fig. 2 is a crosssectional elevation on line 5-5 of Fig. 1, and showing the secondary or multiplying keys. Fig. 3 is a side elevation on the line 3-3 of Fig. 1 in the direction indicated by the arrow, but showing only that portion of the machine between the lines 3 3 and 4-4 Fig. 4 is a side elevation on the row. Figs. 5, 6 and 7 are enlarged detail views of parts of the machine. Fig. 8 is a vertical section of Fig. 12 taken on line 10-11 and showing the position of the parts before the meter wheels have met and been operated by the toothed segments shown in Fig. 9. Fig. 8 is a sectional view on line 10-11 of Fig. 12 looking in the direction of arrow 11, and showing the parts positioned as in Fig. 3. Fig. 9 is a side elevation of a portion of the toothed operating segments; the meter wheels are shown as having been 0 erated, the numerals 9 showing upon t 1e reading line. Fig. 9 is a sectional view on the same line of Fig. 13 looking as per arrow 11*. Fig. 10 is a view of the same parts shown'in Fig. 8 but showing the meter as having been further operated by the teeth of the segments and its wheels stoppedin their movement by the tongues of the over-rotation pawls. Fig. 10 is a sectional -view on line 10-11 of Fig. 12, looking in the direction of arrow 11 and showing the parts positioned as in Fig. 10. Fig. 11 shows the same parts in the next movement, after the overrotation pawls have been withdrawn from contact with the teeth of the Wheels of the meter. Fi 11? isa sectional view on line 10-11 of Fig. 12, lookingin the direction of arrow 11 and shouing the parts positioned as in Fig. 11. Fig. 12 is a plan view'of a part of the meter. Fig. .13 is a cross-sectional view on the line 13-13 of Fig. Fig. 14 is a detail view of part of the mechanism for automatically releasing the adding-keys,

showing the mechanism out of contact. Fig. 15 is another view of the same parts showing thesame in position for operation. Fig. 16 is a plan view of the parts shown in Fig. 15. Fig. 17 is a cross-sectional eleva- 'to in the following power to the drum,

tion on line 17-17 of Fig. 1. Fig. 18 is a cross-sectional elevation on line 18-18 of Fig. 1. Fig. 19 is a left end elevation of one of the carry-up arms 101 and the parts carried by it. Fig. 20'is a front elevation of the same.

Latitude is allowed herein as to details, as they may be changed or varied at will without departing from the spirit of my invention and the same yet remain intact and be protected. I

Corresponding and like parts are referred description and indicated in all the views of the drawings by the same reference characters.

In order that the construction and op eration of my improved machine may be the more readily comprehended, I shall endeavor, whenever practicable, to connect the description of the two, my general method being to preface the description of the mechanism with a statement of the end to be accomplished thereby.

The description of the various mechanisms will be given in order of their operation in the machine.

The framework and main driving mecha n'ism.-Referring to the drawings, 20, Figs. 1, 2, and 3, represent the base-plate or main bed of the machine. The framework is constructed in any suitable form and manner, and I preferably use on each end of the machine an-end side or wall, the side to the right being numbered 21 and the side to the left 22 and between which are placed all the operating parts of the machlne with the exception of parts of the driving mechanism which are inclosed in a box 23 attached to the outer side of the side 22, (see Fig. 1).

In the box 23 at the left end is arranged a spring-drum. 24, journaled on a shaft 25, which has its bearings main casing and side 26 of the box. Arranged within the drums 24 for revolving the driving-shaft 28in one direction is a spiral spring 27 having one end secu'redto the inner circular wall of the drum 24 and its other end secured to the shaft 25, but I have not illustrated this spiral springs connection with the drum nor the ratchet and in connection with it, by which t e spring can be wound or tightened up without turning the gear 29, as the use of the same is quite common in calculating-machines, and any other kindof a spring, giving driving whether electrically wound or otherwise, may be usedif desired. On the outer side of the side 26 of the box 23 the shaft 25 carries a knob 30 for rewinding the spring 27 within the drum.

The driving-shaft 28 is journaled in the end sides 21 and 22 and is the driving-shaft for the meter, the meter'not being operated, as in most calculating-machines, by the downward. or upward movement of the in the side 22 of the awl used era-ace extending upward in the shape of a hood 32,

as clearly shown in Fi s. 2, 3, and 4, and will be hereinafter called t e hood.

The multiplying mechanism is situated in the right end portion -of' the machine, as shown in Figs. 1, 2, 17 and 18, and is nearly covered by the hood. The adding mechanism is situated about midway of the machine, as shown in Figs. 1 and 3, and is nearly covered by the hood but a sight-orifice 33,

preferably in the form of a convexed glass id, is provided for permitting the figures upon the meter and indicator to be read. Tiis sight-orifice extends from about the left end of the multiplying mechanism to the extreme left end of the indicator so that all of the numeral wheels of the indicator and all the numeral wheels of the meter, even when the meter has been shifted to the extreme right, may be read.

By examining Figs. 1, 2, 3, 17 and 18 it v will be noticed that the base 20 is extended (uite a distance forward at the right end of t e machine to allow for the multiplying mechanism, and is also extended forward below the adding mechanism, and'that suitableframeworks 34 and 35 cover the greater portion of the front part of the multiplying and adding mechanisms respectively.

Tie-rods 36 are used throughout the machine to hold different sections of the machine and the two end sides of the machine together so that parts of the machine can be readily separated and adjusted or repaired if necessary. i Primary or adding keys mechanism- My improved machine 1s so constructed that the finger pieces of the primary or adding keys 38, which keys for convenience will be.

ing it in size except lengthening themachinesufficiently to allow for the inserting of the quite extensively.

extra series of segments and the desired extra number of meter and indicator wheels and other necessary parts to correspond, so that.

it could add any number of columns or multipl figures of any amount. By using paralle series of segments I can have any number of series of adding keys, while in a machine as shown'in my prior patents the number of series is limited according to the diameter of the toothed disks and the diameter of the meter wheels.

The series of segments commencing at the right, as shown in Fig. l, are units, tens, hundreds, and thousands, and commencing at the bottom of each series of nine adding keys and going towards the top, the keys are numbered respectively, 1 2 3 4, 5,

It will be noticed that this numbering is the reverse of the numbering in my former above-mentioned patents.

Each set or series of segments 42 consists of nine separate and independent segments and each set is incased or held between two side plates 51 and 89; the side plates on the left of each series of segments being numbered 51, and those on the right 89, and there is also provided a side plate or frame Z2 on the extreme right of the right side plate 89 of the units segments. These side plates 51 and 89 of each series are separated by the spacers 53 on the tie-rods 36. The

series of segments on the right which are the unit-segments, are operated by the right row of the adding keys and these keys are used in all of the arithmetical roblems and offer but little resistance to te depressive movement in order not to tax the strength of the operator, and each key without respect to the value represented receives the same degree of downward movement. These se ents have on their inner edge one or more ugs or teeth 50 (see Figs. 1 and 3). For example, the segment of key 1 of each series is provided with one tooth, the se ment of key 2 of each series with two teeth the segment of key 3 of each series with three teeth, and so on, and it will be noticed, by examining Fig. 3, that the segment of key 9 of the units series, which key is de ressed,

is provided with nine teeth, and t at this toothed segment of nine teeth has been displaced out of normal position by the pressure down upon the fin er iece, and is in driving contact to be met y t e meter when it is revolved with the driving-shaft 28, which meter is arranged to be revolved around the inner side of the machine and to be operated by the teeth of the displaced segments.

The segment on the extreme left of each series is the segment that has one tooth, which tooth is near the lower inner end of the .segment, and is operated by the respective key" of that series which bears the numeral 1, and this tooth is parallel to .the tooth on each of the segments on the extreme left of each series which is operated bya key bearing the numeral 1 the next segment 'to the right has two teeth, the second tooth being parallel to the tooth on the first seg second segment the next segment to the right ends, each of which is provided with a s has four teeth, and so on, so that the segment on the extreme right of each series, which is the ninth segment, has nine teeth, the first tooth being above any of the other teeth on the other segments of the same series and the ninth tooth being parallel to the tooth of the first segment and to the lower tooth of-each of the other segments. It is thus seen that the lower teeth of all of the segments of all of the series are parallel to each other so that each of the meter wheels leave the teeth of the segments simultaneously.

The shanks 37 of the adding keys 38 may if desired bemade integral with the segments, but I preferably make the'same. of separate parts and connect'by a-pin, rivet or'other means 39, the lower portion of each shank with abackward extending lip 40 of its corresponding segment, and to the lip isconnected a spiral spring 41 fastened at its other end to the inner side of the framework 34, which spring is distended when the segment is disp aced and returns the segment and its corresponding key to initial position when the segment is released, as hereinafter explained, after the meter has come in contact with'its teeth the desired numberof times: Each of the "shanks 37 is provided with a slot 52 through which 1pass'es'a uide pin 87. The segments are a soprovi ded with the back ward extending arms or lips 43 at their upger 0t 44 through'which the retaining or guide pin 49 passes. Each segment is extended downward in two parts as at 45 and 46, the portion 45 being provided with the elongated slot 47 through which passes the. guide pin 48. The

,segments'may also be provided with the elongated slots 57- through which'the guide pins 58 pass. The "slots 44, 47, and 57 are all similar and of the same length. When the toothed segments and adding keys and their shanks are shaped as shown in Fig. 3, and as just described, the alinement ofthe teeth of the segments will be true to be meshed with-the teeth of the corresponding meter wheels when the meter is revolved with itsdriving shaft 28 around the inner side of the segments.

, Mechanism for allowing 0 the return of the 'addrlng' mechan'ism.- he segments 42 are provided near their central portion with the openings 54 the openings in all of the segments being uniform and preferably of a sha e similar to that shown in Fig. 3. A

sha t 55, operated by a lever 56 without segments.

the framework, (see Figs. 1 and 3) extends through the side plate 72, all of the side plates 57 and 89, and the openings 54 being journaled in the plate 72 at the extreme right of the segments and in the plate 51 at the extreme left of the segments. Mounted upon this shaft- 55, and one for each series of segments, are the pawls 59 held in a downward position 'within the openings 54 and against the lower edges of the openings by the flat springs 60 which springs also keep the lever 56 in its uppermost or normal position. Each of these springs are attached to its corresponding side plate 51 as shown in Fig. 1 in the broken away portion of the tens" The openings 54 are cut into the segments 42 in such a manner as to form on ,each segment a tooth 63 and indentations 64 and 65. The pawl 59 of each series of segments normally fitting into the lower indentation 64 but as each segment is displaced, the pawl is thrown into the upper indentation 65, and

presses down, by pressure of the spring 60,

against the upper face of the tooth 63 keeping the teeth 50 of the segment 42 in a'rigid and firm position to be met by a .wheel of the meter, until released as herein explained. In order that the-lever 56 may not be slightly moved every time a segment is displaced, I allow each of the pawls to have free movement upon the shaft 55 but limit this move ment by the keys 61 in the shaft 55 moving in a keyway (not shown), there being one key for each series of segments. It is therefore readily seen that I canby pressure down upon the lever 56 instantly'and simultaneously reset all of the segments and their re- 4 spective adding keys or I can reset to its normal posit-ion any segment and its corresponding key by the displacement of any other segment ofthe same series; this latter being of great benefit i i-addition and other problems adding keys as soon. as the meter has once met the teeth of the segments in its movement around the inner side of the machine and without waiting for the meter to have reached its original or normal position and for this purpose I have provided such means, which I shall onlypartly explain at the present time, as an explanation of the multiplying mechanism is essential to a clear understanding of the same, which explanation I shall give in the latter part of this s eoificang downward therefrom, carrying atits lower portion a stud pin 67 movable in the slot 69 in the free end of the arm'68, whicharm isconnected at its other end to a shorter arm 70 mounted on the-shaft 71, (see Fig. 3). The shaft 71 extends from the side plate 72 toward the right being mounted at its other end in the bracket 88, (see Figs. 1, 3 and 14 to 17), and the same is operated automatically as later explained,

A spiral spring 73 attached at one end to a stud extending from the side plate 72 and at its other end to the-lever 66 serves to keep the lever in its proper position against the stud pin 62, except when it is being operated, and may serve also for the purpose of keeping the lever 56 in its proper position. A

- stud pin 91, extending outward from the side plate 72 a sufficient distance, limits the backward movement of the lever 66.

T he mam-The indicating-meter, which for convenience-will be designated in the specification and claims as the meter, is independent of the adding keys and is'used for showing the figures as they are added, in

dicating the final sum in addition, indicating the product in multiplication, indicating in subtraction, first, the minuend and, second, the difference after deducting the subtrahend, and in division showing, first, the dividend and, second, after dividing the divisor, shows the balance left over, which is smaller than the divisor.

A carriage hub or cylinder 74 is carried by the driving-shaft 28 being keyed thereto as at 7,5 and is horizontally slidable thereon and carries the two upward-projecting arms 76 and 77, in which arms is journaled the shaft -78 of the numeral wheels 79 of the meter,

which shaft for convenience will be herein- The arm 7 7, which is atthe extreme left of the meter, is provided near its upper forward end with a finger 8O projecting towards the right, and which linger is used to turn the indicatorwh eels of the indicator as the meter is revolved. The meter in this invention is not revolved away from the operator, as in my other patents, but is revolved towards the operator .or front ofthe machineas soon as it is set in motion, so that the finger 8O operates a wheel of the indicator before anykof the numeral wheels 79 of the meter are operated. Upon the upper end of thearm 77 and extending towards the right and arranged to come in contact with another tooth of the indicatorto stop the movement of the indicator-wheel of the indicator, moved by the first finger 80, and thus prevent overrotation, is a second finger 81. The operation .of the indicator by these fingers will be later fully I explained,

the rims of the wheels, and are separated by the meter supports or arms 93. The meter supports-92, 93 and 94 arecarried by the cylinder 74 being keyed thereto as at 75. The wheels at each extreme end are also separated from the arms 76 and '77 by sleeves, spacers or other means. These numeral wheels .79 each carry upon their periphery a series of teeth 84, preterablyten in number, and between these teethare spaces 85, on .which the mathematical symbols 0, (17)) (2,)! ((3,)! (1-4,)! ((5,7) ((6,7) ((77)) ((8,1) 9, are affixed in any desirable manner, and when the meter is immovable and the numeral wheels 79 are in their normal positions the naughts iwould show, in a reading line, just above the hood 86,.when looking fromthe line of vision through the sightorifice 33 of the hood 32. These-numeral wheels 79 turn from left to right (which is the reverse of the movement shown in m former patents) .when engaged by the teeth 50 of the segments 42, and the next number that would show wouldbe the numeral 1- and the next 2 and so on, and if the wheels had been turned by nine teeth they 25 vwould be in the position shown in Fig. 12.

The teeth 84 of eachnumeral wheel 79 extend beyond therim on each side, projecting in such a way on the left of each wheelthat an over-rotation check-pawl 128 will come in contact with two of its teeth (see Fig. 10) to instantly check it in its movement from left to right as soon as its teeth 84 have finished meshing with the teeth 50 of the segments 42, and the teeth also projecting on the right of each wheel in such a way that a carry-up finger 102 (see Figs. v11, 11 .will

strike against one of the projecting teeth, turning the wheel one-tenth of its circumferen'tial distance for transferring the movement of the lower numeral wheel to the next succeeding higher numeral wheel, .as from a units to a tens numeral wheel, or from a tens to a hundreds numeral wheel, and so on. A full explanation of the over-rotation checkpawl 128, thecarry-up finger 102, and their contiguous parts will be hereinafter given.

Between the arm 76 and the first numeral wheel '79 of the meterand carried by the cylinder 74 being keyed thereto as at 75 is an upward extending arm 92 and similar arms 93 are-placed between each of the numeral wheels 79; each-of the arms 92 and 93 being provided with the slot for the purpose hereinafter stated.

An-arm 94 similar to the arms 93 but without theslot 95 is also placed on the left'of the last numeral wheel, between the wheel and the striker-arm 77. Between the arm 76 and the arm 94and carried by the arms -92-and 93.

g V stream is a U shaped hood or guard 86 covering, when the meter is in its normal osition, the forward portions of the arms an a large part of the mechanism carried by the arms, also covering the lower half of the numeral wheels 79 so that in looking from the line of vision through the sight-orifice 33 at the meter the .desired number to be shown upon each numeral wheel will be seen just above the upper line of the guard 86.

' The arms 92, 93 and 94 are separated by the spacers 289 on the cylinder 74 and are held 1n their proper positions by three tierods 96, 97 and 9.8, which are about equal distance apart, and the'tie-rod 97 is situated just within the V-point of the guard. vThe tie-rod 96 which is placed near the lower edge of the guard is also used to support one end of theflatsprings 150, the other end of the springs pressing against the numeral Wheels v .and preventing back movement of the same.

Just below the tie-rod 9 6 and between this tie-rod and the driving-shaft 28 and extending through the arms 92, 93, 94 and the striker-arm 77 is journaled a rock-shaft 99' provided with a key 100; this rock-shaft 99 being about midway between the drivingshaft 28 and the tie-rod 97. Mounted upon the rock-shaft 99 are the carry-up arms 101 (one for each numeral wheel 79) situated between the arm 92 and the first numeral wheel and between each of the arms 93 and the adjacent numeral wheels on their left, as shown in Fig. 1. These carry-up arms 101 can be clearly understood by examining Figs. 8 to 13, 19 and 20. Each of the arms 101 have keyways 103 through which the hey 1 00 extends, and are also provided with a spiral spring 104 attached to the stud 105 extending outward from the arm towards the left just above the lzeyway 103 and the other end of the spring being attached to the tie-rod 97 so that the carry-up arms 101 have'a forward motion when not held by other means, as hereinafter fully explained.

Each of the carry-up arms 101 is provided about midway with the upward-extending curved parallel fingers 106 and 107, made integral with it and forming a runway 108 through which the guide-pin 109 protrudes; this guide-pin extending outward towards the left from the arm 92 and the arm 93 and causing the carry-up arm 101'when drawn forward by the contraction of the spring 104 to run true.

Immediately in the rear of the run-way and extending outward towardsthe left from the carry-up arms 1.01 is a stud 110 upon which is pivoted a carry-up finger 102, the

aosite end attached to a stud 113 extending omthearm 101 just belowthe stud 105.

T he carry-up finger 102 is adapted'to strike against the right side of a projecting tooth 84 of the numeral wheel 79 upon its left, turning the numeral wheel one-tenth of its circums ferentialdistance upon each full forward movement of the carry-up arms 101 thus transferring the movement of the lower numeral wheel upon its right to the next succeeding higher numeral wheel upon its left. As there is no higher numeral wheel upon the left of the arm 94 this arm is not provided with the carry-up arm 101 or its carry-up finger 102. v 4

Each carry-up arm 101 is bow-shaped near its upper portion ending in a finger projection 115 which is adapted to run upon the segmental run-away 90, as shown in Figs. 10 and 10, whenever the carry-up arm 101 has been released and drawn forward by the spring 104, while the meter is passing the I teeth 50 on the segments 42 and thus.pre-- venting the carryrup arm 101 from going its full forward distance and the carry-up finger 102 from coming in contact with its corresponding numeral wheel 79, as it is not desir able to carry-up from one numeral wheel to the next succeedin higher numeral wheel while the numera wheels are passing through the only extends a short distance below the segments, as shown in Fig. 3. so that the carrying process is completed immediately after the numeral wheels of the meter have passed the segments 42 as shown in Figs. 11, 11

' As the meter is revolving around the inner side of the machine the finger 115 of the carry-up fingers 187 upon the left sides of the plates 72, 51 and 295, as shown in Figs. 1 and 3, by which each of the arms in its turn, commencing with the arm on the right, is IGOOGkGd: The arms 101 may also be recocked by the turning from left to right of the rock-shaft 99 by thefbackward movearm 101 meets the recocking segments, butthe runway 90 ment of the plate 152 see Fig. 4 as hereinafter explained.

In order to have a recocking finger for each of the arms 101 I have provided the necessary additional plates 295 in the rear of the machine, as shown in Fig. 1, to sup-- port the additional recocking fingers.

Recocking could be done simultaneously but it would throw a heavy load on meter shaft during that short space of its revolutions This would tend to disturb an even speed. of themeter which is desirable. By making it successively, as shown, this load is distributed over a much larger space of the revolution of the meter.

There is only one recocking finger .for each of thearms 101. The recocking finger to the extreme right is attached to plate 72 and one recocking finger to each of the plates 51, but as there is only one plate 51 "and there is a considerable amount of to the left. ofthe extreme left bank of segments it is necessary to provide the additional short plates 295 for each of the arms 101 on the left portion of the meter so that 3 there is a recocking finger for each of the arms 101 when the meter is in its normal this is necessary when addition is these left recocking fingers are not always used but there are cases when it 1s necessary to have them.

Extending from the left side of the carryup arm 101 about midway between the pin 111 and the end of the finger 115 is a stud 116 (see Fig. 11) carrying a pawl 117 having a projection or hook 118 extending towards the right (see Fig. 12) and adapted to be seated within the slot 95. and extending through to be met by the tooth '1 19 of the cam 120, which cam is carried on the hub 121 of the numeral wheel 7 9, each of the hubs 121 being on the meter-shaft 78 and each numeral wheel turns its respective cam 120'. A similar cam 120 is also provided upon the hub 122 situated between the arms 76 and 92. The pawl 117 is also provided with a short arm carrying a spring 123'which spring presses against a stu 124 so that the long arm of the pawl 117 and its hook 118 will be held downward except when pushed upward by the tooth 119 of the cam 1-20 and I held in this position, as shown in Fig. 10, by

the upper curved portion of the arm 93. The arm. 101 is also provided with a stud 297 against which the short arm of the pawl 117 is pressed by'the force of its spring 123, as

shown in Fig. 8, but when the tooth 119 of the cam 120 rides the pawl upward so that the hook 118' is on the curved portion of the arm 93, the short arm of-the pawl 117 is away from the stud 297 (see Fi 10) but when the finger 115 has run 0 the runway 90, the spring 123 working against the stud 124 keeps the short arm of the pawl 117 against the stud 297, which stud 297 prevents it from dropping toofar down} see Fig. 11. A curved tooth 125 also extends outward from the left of the carry-up arm 101 just above the pin 111 and this tooth is adapted to come in contact with another pro ecting tooth 84 of the numeral wheel when the carry-up finger 1.02 is thrown forward-from the position shown in Fig. 10 to the position shown inv Fig. 11. The carryup fingers-102 and the teeth 125 come in contact only with the portion of the teeth 84 that project: beyond the rim on the right side of the numeral wheels 79 and up arm 101 or any of the parts carried by it for the obvious reason that there is no need of these parts beyond;the highest numeralwheel, but the parts ofthe mechanism which I shall now describe as being carried by the arms 93 are also carried by the arm 94 butnot by the arm 92.

The arm 94is not provided with acarry- I Projecting from the right side of each of v the arms 93 and 94 is a stud 126 upon which is pivoted an over-rotation check-pawl 128 which is provided with a tongue 129 adapted to be thrown between .two teeth 8 1 of a numeral wheel 79 by the pressing back of the 0pposite arm 127, by the pin 131 upon the end of this arm, coming in contact with a forward projecting lip 132 of the side plate 51, so that as the numeral wheels leave the segments 42, as shown in Fig. 10, the pawls are thrown in contact with that portion of the teeth 84 that projects beyond the rims of the numeral wheels 79 on their left sides in such a manner as shown in the drawings that will instantly stop the forward-movement of the I numeral wheels and prevent over-rotation.

The pawl 128 is however normally held out i of contact with the teeth 84 by as iral spri 130 one end of which is attache to a stu carried by it to draw it downward and backward against a pin 149; the opposite end of the spring being attached to a stud 133 on the further rear end of the arm 93 or the arm 94, as the case may be.

Each of the numeral wheels 7 9 consists of a web '135 on the hubs 12 1 carrying a rim 134 provided with the teeth 84 between which are the spaces. 85 carrying the mathematical symbols. Beneath the rim 134 on the right side of each wheel and extending outward 'from the web 135 is a spring-pressed pawl the meter isthus set at naught, that is, so. that all of the numeral wheels 0 .are in a line on the reading line of the meter. A. similar spring-pressed pawli's within each of the indicator-wheels 139 of the indicator, so

back to its original position after each arithmetical problem.

The tndicator.ln the left forward portion 7 j of the machine and seen through the sightorifice 33 is situated the indicator see'Figs.

1 and 4, consisting of the shaft 142 carrying never l the freely-movable hubs 143, of the indicator 12o that the indicator can be set in a similar way wheels 139. Each wheel is adapted to be turned from left to right and is provided with a series of teeth 140, preferably ten in number, and between these teeth are spaces 141 5 on which the mathematical symbols 0,

((17), H 277, 377" ((41)), H 5)) (r677, ([77), (1877,

9, are marked and when the indicatorwheels 139 are in their normal positions the naughts would show just above the forward edge of the sight-orifice 33 so as to make a good even reading line for the indicator.

The teeth 140 of each wheel project be yond the rim on the left side of each wheel to be met by the finger 80 projecting towards the right on arm 77 so that one of the wheels 139 of the indicator is moved one-tenth of its circumferential distance each time as the meter is revolved by its driving-shaft. Each wheel is prevented from over-rotation by the finger '81, upon the arm 77 in the rear of and somewhat above the finger 80, coming in contact with the projecting part of another one of the teeth 140 on the indicato'nwheel immediately after therevolving of this same indicator-wheel by the pressure of the finger 80 soas to instantly check the movement of this wheel.

The indicator is supplied with springpressed'pawls 144 similar to those of the numeral-wheels 79 of the meter, which pawls extend through slots in the hubs 143 and into a slot in the indicator-shaft 142 so that the shaft can be turned and the indicator wheels simultaneously turned forward to initial position. I

The indicator does not shift from right to left similar to'the meter but remains a stationary position so that when the meter is revolved in its first position, the first or leftv hand wheel of the indicator would be operated; when the meter has been shifted one position the second Wheel. (that is the' second wheel from the left end of the machine) would be operated, andso on.

Loosely mounted upon the shaft 142 is a gear 145 carrying a ratchet 147 adapted to be met by a spring-pressed pawl 148 on the wheel 146 rigidly attached to the shaft 142 so that when the gear 145 is turneda sufli- 'cient distance from left to right bythe teeth 291 of the sector 160, or by any othermeans, .the'indicator wheels 139 will be turned around by the shaft 142 as previously explained. Upon-the backward movement of the." sector, see Fig. 4, the'pawl 148 passes over the teeth of the ratchet 147, and the shaft 142 and the indicator wheels 139 are not'moved. 4 v i Resett'ing means.-The teeth 291 of the sector are held in alinement with the teethof the-gear l4j5by the guide-pin 162 in its curvedslot 161, as clearly shown in Fig. 4; This sector is provided with the arm .163

the upper forward end of the.

eve n9 to which is fastened one end of a spring 293, for returning the sector, and having its other end fastened as at 294 to the inner side of the left end wall 22.

Secured in any suitable manner upon the of the curved rack 173, provided with the teeth 292 to mesh with the teeth of the gear 164 on the shaft 78. This gear carries .a ratchet 165 whose teeth are met by a springpressed pawl 167 on the disk 166 secured on the shaft 78, so that as the rack 173 moves the gear from left to right, the disk and the shaft 78 are also turned from left to right to move the numeral wheels of the meter as hereinbefore explained.

When the rack is returned to initial position, the gear and ratchet are revolved from right to left but without turning the disk or shaft, as is 173 is also provided with the slot 176, similar to the slot 17 4, and through which the pin 179 extends from the lever 168: A bar 172, movable upon the pin 170 of the lip 169 of the lever 168, is provided at its lower end with a pin 178 extending through the slot of the rack 173 and which pin presses against the v handle portion 182 of the bar 172 is pressed against the upper handle portion of the lever 168, so thatthe rack is pressed upward to have its teeth in meshing contact with the teeth of the gear 164 when the handle portion 182, without the case is drawn forward through a forward extending portion of the slot 186. The slot 186 also extends lengthwise of the machine for a distance equal to the'lengthwise movement of the meter. A spring 181 returns the rack 173 and bar 172 to initial positions as soon as pressure is withdrawn from the handle 182.

Upon the rock-shaft 99 on the left side of the arm 77 is firmly secured a plate 152 hav ing its lower end secured by a spring 153 to a lip 154 of the arm 77 but the lower end is limited in its downward movement by the in 155 on the arm. This plate carries a also carries an upclearly understood. The rack side of the slot when the upper stud 156 upon which is freely movable a As the lever 168i's moved forward itspin 183carries forward the sector'160, and the pin on the rack 17 3 presses against the pawl 157, slightly raising it and pressing its s ring 158 against the pin, but passes beyond t e pawl which is returned to initial osition l with its tail against the pin 159, by t e force of its spring 158. en the rack is returned 

